Title:
CATALYST FOR LEAN BURN
Document Type and Number:
WIPO Patent Application WO/2017/222017
Kind Code:
A1
Abstract:
The present invention relates to a catalyst for lean burn, which is capable of sufficiently removing NOx, while exhibiting high removal performance of CO or HC in a wide temperature range from low temperatures to high temperatures. The preset invention provides a catalyst for lean burn engines for exhaust gas purification, which has a monolithic carrier and a catalyst layer that is disposed on the monolithic carrier and contains a noble metal element, while being composed of at least two layers, namely an upper layer and a lower layer, and which is characterized in that the catalyst layer contains at least a proton-substituted β zeolite and a ceria-based oxide that supports rhodium in the upper layer, while containing at least a NOx storage component and platinum supported by an inorganic oxide in the lower layer.
Inventors:
ANDO RYUJI (JP)
KAYADA YUTO (JP)
KAYADA YUTO (JP)
Application Number:
PCT/JP2017/023053
Publication Date:
December 28, 2017
Filing Date:
June 22, 2017
Export Citation:
Assignee:
N E CHEMCAT CORP (JP)
International Classes:
B01J29/74; B01D53/94; F01N3/10
Domestic Patent References:
| WO2015029382A1 | 2015-03-05 |
Foreign References:
| JP2013528119A | 2013-07-08 | |||
| US20150165422A1 | 2015-06-18 | |||
| JP2010510884A | 2010-04-08 | |||
| JP2013537846A | 2013-10-07 | |||
| JP2013139718A | 2013-07-18 |
Other References:
See also references of EP 3476480A4
Attorney, Agent or Firm:
INABA, Yoshiyuki et al. (JP)
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